The Peter Newell Family Papers consists of correspondence, manuscripts, printed material, photographs, drawings, paintings, prints, toys, and sculpture by or relating to Peter Newell and his family, including his sons-in-law Howard McCormick and Alfred Z. Baker. Correspondence files contain letters from artists, writers, and editors of the period; family in Kansas, Illinois, New Jersey; Clendenon Sheaf Newell at Cornell University; as well as family friends Frances Sage Bradley, Walter Karig and Charles Edward Smith. The collection includes over 3,000 sketches, preparatory drawings, finished illustrations, printed proofs and tearsheets for Newell's book and magazine work. Also included are 67 mammoth plate photographs of the American West and Mexico by William Henry Jackson, presumably acquired by Newell.